Biotechnological Production of Odor-Active Methyl-Branched Aldehydes by a Novel α-Dioxygenase from <i>Crocosphaera subtropica</i>
作者:Andreas K. Hammer、Florian Albrecht、Friederike Hahne、Paulina Jordan、Marco A. Fraatz、Jakob Ley、Torsten Geissler、Jens Schrader、Holger Zorn、Markus Buchhaupt
DOI:10.1021/acs.jafc.0c02035
日期:2020.9.23
anteiso-fatty aldehydes represent promising candidates for applications in flavoring preparations. A novel cyanobacterial α-dioxygenase from Crocosphaera subtropica was heterologously expressed in Escherichia coli and applied for the biotechnological production of C12–C15 branched-chain fatty aldehydes. The enzyme has a sequence identity of less than 40% to well-investigated α-dioxygenase from rice. Contrary
由于其令人愉悦的气味质量和较低的气味阈值,异-和反-异脂肪醛代表了在调味品制剂中应用的有前途的候选者。一种亚热带鳄鳄的新型蓝细菌α-双加氧酶在大肠杆菌中异源表达,并用于生物技术生产C 12 -C 15支链脂肪醛。该酶与水稻中经过充分研究的α-双加氧酶的序列同一性小于40%。与后者相反,它有效地转化了短链脂肪酸。通过氧耗竭试验研究了α-双加氧酶对非支链和异支链底物的动力学参数。转型产品(C对12 –C 15异醛和前异醛进行了广泛表征,包括其感官特性。醛类表现出绿色的甜味,带有柑橘类,金属,胡椒和咸味的细微差别。此外,这两种C 14异构体在空气中的气味阈值极低,分别为0.2和0.3 ng / L(通过气相色谱-嗅觉法测定)。